Bolt nutting machine



Feb. 13, 1940. w. MAJUSICK BOLT NUTTING MACHINE Filed Aug. 11, 1938 9 Sheets-Sheet 1 3rwentor WQLTEE Marys/ck attorney MIH BOLT NUTTING MACHI NE Filed Aug. 11, 1938 9 Sheets-Sheet 2 Qttorneg W. MAJUSICK BOLT NUTTING MACHINE Filed Aug. 11, 1938 Feb. 13, 1940.

9 Sheets-Sheet 4 Ihwentor Warez G-J'USICK $1.4; {il 2 attorney Feb. 13, 1940. w. MAJUSICK BOLT NUTTING MACHINE Filed Aug. 11, 1938 9 Sheets-Sheet 5 (Ittomeg W. MAJUSICK BOLT. NUTTING MACHINE Feb. 13, 1940.

Filed Aug. 11, 1938 FIE.

9 Sheets-Sheet 6 Zhwentor [Mensa MflJl/SICK attorney Feb. 13, 1940. w. MAJUSICK BOLT NUTTING MACHINE Filed Aug. 11, 1938 9 Sheets-Sheet 7 3 no @1110 r W91 new Mmms/c/r Gttorneg Feb. 13, 1940. w. MAJUSICK BOLT NUTTING MACHINE Filed Aug. 11, 1938 9 Sheets-Sheet 8 (Ittorneg BOLT NUTTING MACHINE Filed Aug. 11, 1938 9 Sheets-Sheet 9 (Ittotneg Patented Feb. 13, 1940 UNITED STATES BOLT NUTTING MACHINE Walter Majusick, Cleveland, Ohio, asslgnor of one-third to Walter L. Pierce, Lakewood.

Ohio

Application August 11, 1932. Serial No. 224,279

6 Claims.

My invention relates to bolt nutting machines and to the simplification and improvement thereof.

One object is to provide improved means whereby bolts and nuts are carried simultaneously to the same point from different sources and the nut held in position until the bolt is screwed within the nut, whereupon the assembled product is delivered to a receptacle. I h

Another object is to provide a means whereby the bolt may be delivered to another receptacle if for any reason the nut is not delivered to the meeting point; also the nut may be delivered to a third receptacle if the bolt should not reach the meeting point as mayhappen especially if the hoppers are not kept filled.

A further object is to provide a means whereby the progress of either the bolts or the nuts may be arrested when desired to check the progress of the other through their respective channels. These and other objects and advantages may be noted from the following specification and its accompanying illustrations, in which:

Fig. l is a top plan view of the machine and its motive power.

Fig. 2 is a front elevation of the machine.

Fig. 3 is a left side elevation of Fig. 2.

Fig. 4 is a rear elevation of Fig. 2.

Fig. 5 is a right side elevation of Fig. 2.

' Fig. 6 is a section on line li5 of Fig. 1.

Fig. 7 is a fragmentary section partly in elevation, showing the delivery point of the bolt and nut and the nut 'arrestor in closed position.

Fig. 8 is a fragmentary elevation partly in section showing the bolt delivery wheel, operating cams and bolt arresting device with the bolt suspended, dot-dash lines showing the method of delivery and cam operation. 7

Fig. 9 is a sectional view of the nut hopper and delivery channel.

Fig. 10 is a fragmentary sectional view of part of the bolt hopper and delivery elevator and the operating means.

Fig. 11 is an enlarged sectional view of the bolt turning head in turning position. I

Fig. 12 is a similar section to Fig. 11 but with the head in inoperative position.

Fig. 13 is a sectionon line l3-I3 of Fig. 11.

Fig. 14 is an enlarged sectional view of the head turning means in the operating position.

I Fig. 14A is a view similar to Fig. 14, but showing the shaft extending outwardly and the spring compressed in the safety position.

Fig. 15 is a sectional view similar to Fig. 14

but showing the head turning means in the operative position.

Fig. 16 is a front end view of the turning head for square head bolts.

Fig. 17 is a similar view of the turning head for hexagon head bolts.

Fig. 18 is a similar view of the turning head for round head bolts.

. Fig. 19 is an enlarged fragmentary front elevation of the nut thrust shaft illustrating the. adjustment nuts and compression spring safety means.

Fig. 20 is a front elevation of the nut platform and thrust.

Fig. 21 is a section similar to Fig. 6, but showing a modified form of the machine adaptable to different lengths of bolts.

Fig. 22 is a fragmentary view of a front elevation of the modified form illustrated in Fig. 21 and showing the additional parts and operating and adjustable means. a

Fig. 23 is a fragmentary view of the rear elevation of Figs. 21 and 22 showing the adjustable means.

Fig. 24 is a section on lines 2|24 of Fig. 22.

Again referring to the illustrations, a frame consists of supports l0 and "la, and longitudinal bars II and angles l2 and I! which support a table l4, said table having elongated openings l5, l6 and [Ba therethrough at opposite ends of said table.

A driven shaft I1 is mounted beneath the table I through an end support Illa at one end and within bearing supports! and 20 at the middle and opposite end, said bearing supports being secured to the underside of the table H.

A cam 2| ismounted over the projecting end of the driven shaft I1 and secured thereto by a pin 22. Mounted over the driven shaft ll between the end support llla and the bearing support I 9 is a spacing cam 23 secured to said shaft by anadjusting set screw 24, and a second cam 25 is mounted on the shaft l1 adjacent cam 23 and is secured thereto by an adjusting screw 26, spacing washers 21 and 28 and bearing 29 being mounted over the shaft between the bearing support [9 and the cam 25.

A thin spacer 30 and a pair of adjustable spacers 3| and Ma are mounted over the shaft ll outside of the bearing bracket l9; and adjacent the adjustable spacer 3la is a third cam 32 secured to the shaft H by an adjustable set screw 33 between said spacer 3la and abearing 29a adjacent the bearing bracket 20.

A gear 34 is secured to the inner end of the shaft I1 adjacent the bearing bracket 20 and meshes with a reduction gear 35 mounted on the end of a drive shaft 36, adjacent its bearing support 31. A drive gear 38 is mounted on the drive shaft 36 between the bearing brackets 31 and 39; a pulley wheel 40 is secured to the shaft 36, outside of the bearing bracket 39, and is motivated by a belt or pulley 4| running from the pulley wheel 40 to the motor 42.

A mounting 43 secured to the top of the table I4 and partially covering the opening |6a in said table has an upturned flange 43a therein which serves as a bearing support for one end of a driven shaft 44, the opposite end being mounted through the wall of the said mounting 43.

A driven gear 45, mounted on the end of the driven shaft 44 adjacent to the flange 43a, meshes with the drive gear 38, the revolutions being one to one.

A pivoting operating arm orpitman 46 is secured at its lower end on a pin 41 mounted rotatably through the gear 45 adjacent the outer periphery thereof, the upper end of said pitman being pivotally secured between lugs 48 and 49 on the face of a sliding bolt lifting elevator 50, by a pin 5| mounted therethrough.

The bolt lifting elevator 50 is slidably mounted in a trough 52 in a bolt hopper 53, guides 54 and 55 preventing tipping or binding as the elevator 50 slides up and down within the trough 52 to receive the discharge its load of bolts 56.

The tapered upper edge 50a of the elevator 50 holds the bolts 56 against the wall 53a (Fig. 10) until the lifting of the elevator discharges the bolts into a gradient or inclined track 51; each complete revolution of the driven gear 45 motivated by meshing with the drive gear 38 causes the operating arm 46 to rotate and thus raise and lower the elevator once.

A top guard 51a secured over the open track 51 by yokes 51b and 510 prevents the traveling bolts from jumping out of said track as they move downward.

The reduction gear 35 meshes with a smaller driven gear 58 mounted on a driven shaft 59 adjacent the mounting or bracket 31, the said shaft being supported between the .mounting brackets 31 and 60.

On the outer end of the shaft 59 is secured a sprocket 6| from which a link chain 62 drives a second smaller sprocket 68 mounted on the outer end of a cam shaft 64 mounted through bearing supports 65 and 68 of a bearing hanger 61.

A small gear 68 is secured on the cam shaft 64 between the supports 65 and 66 and adjacent thereto is a cam 69 also secured on said shaft. A pulley 10 is secured to the outer end of the shaft 64 adjacent the bolt hopper 53 and directly below a pulley 1| secured on a cross shaft 12 mounted between a pair of brackets I3 and 14 secured to the side of the hopper 53.

A crossed belt 15 is mounted over both pulleys 10 and 1| to motivate the shaft 12 and operate an agitator wheel 16 which forces the bolts 56 to assume an upright position in the gradient or track 51, said track conveying the bolts thus discharged downward to the release trap I1.

The release trap has a pair of cam operated pins or pistons 18 and 18a (Fig. 8) that reciprocate alternately with the in and out movement of the cam pivot arm pivoting on the pin 80b as the roller 80a moves over the cam 25, and a spring 19, mounted on the underside of the table, presses the cam arm against the cam.

A bolt arrestor 82 has a setting knob 83 pivotal- 1y mounted in the center of the face of the bolt arrestor; a plurality of depressions 82a in the said face of the bolt arrestor receive the pin 85 of the setting knob 83 when the knob is drawn outward and rotated, a spring 84 is compressed between a bolt arrestor block 82?) and an angular arm 86 within which a pivot pin 83b is journaled, the central position being the release position and the top and bottom positions being the arresting positions. As the knob rotates, the arm 83a mounted over the pivot pin 83b moves up or down causing a finger 86a, projecting from the angular arm 86, to rotate up or down and press against the cam arm 80 preventing the outward movement of the said cam arm, the bolt 56 is thus trapped as shown in Fig. 8. This is done at will to allow checking of the nut delivery line.

When the bolt 56 is to be released the pistons 18a and 18, respectively, move forward and back, then as they again move to the original position as shown in Fig. 8, the bolt 56 drops into one of the spaced grooves or notches 88a in the outer periphery of a delivery wheel 88 which is rotated clockwise on a shaft 81 as the spacer cam 23 rotates anti-clockwise.

Rollers 89a are mounted on pins 89 journaled in apertures 90 through the delivery wheel 88; open spaced apertures 9| in the outer periphery of the spacer cam 23 engage the rollers 89a and rotate the delivery wheel 88 until the bolt 56 reaches the top position as shown in Fig. 7, and the roller 89a has reached the inoperative level 23a of the cam 23 as shown in Fig. 8 whereupon the delivery wheel 88 stays in this position until the continuously rotating cam 23 rotates to the position where the next roller 89a, on the face of the delivery wheel 88, engages the next aperture 9| in the outer periphery of the cam 23, whereupon the process is repeated.

A guide spring 51d secured to the guard 51a, guides the bolts 56 and prevents their slipping out of place as they travel around the delivery wheel 88.

As the cam 2| rotates with the shaft I1 (Fig. 6) a roller 92 attached to a cam lever 93 moves in and out on the cam pivoting on a pin 94 thrust through a split bracket 95 projecting outwardly from the auxiliary shaft support 96 attached by bars 91 and bolts 98 to the bearing support 65. A spring 99 is attached to the auxiliary shaft support 96 and projects upward and outward against the top of the cam lever 93.

The cam lever 93 terminates at its upper end in a yoke 93a, said yoke fitting within an H sleeve I00 (Fig. 14a) which has an aperture I0| therethrough, and said H sleeve is mounted over the smaller shouldered end I02 of a head operating shaft I03; a spring I04 is mounted over the shouldered portion I 02 of the shaft I03 within the aperture IOI of the H sleeve I 00, and a head I05 is secured over the outer end of the shouldered portion I02 of the shaft I03; said shaft being free to reciprocate within the H sleeve I00 as well as rotate.

This provides a safety means whereby jamming is eliminated due to the reciprocating action under excessive pressure, the shaft moving outwardly and compressing the spring I04 as illustrated in Fig. 14a, thus relieving excessive pressure.

The shaft I03 is slidably and rotatably mounted within a bearing I06 mounted through the auxiliary shaft support 96 and thebearing support 65. A small sprocket I01 is also mounted over the shaft I03 by means of a key. I010. in a amomrzv ,keyway in the shaft, said sprocket being mounted the arms revolve at each side of the reciprocatbetween the auxiliary supp rt 96 and the bearing support 65. Alink bolt I08 connects the sprocket I01 to another larger sprocket I09 secured on the cam shaft 64 outside of and adjacent the bearing support 65.

The shaft I03 has secured at its inner end a bolt turning head IIO-by a set screw III; the end of said shaft I 03 has an orifice II2 therein within which is mounted a spring II3; a sliding piston II4, terminating in a head H5 at its outer end and having a slot II6 therethrough at its inner end, is mounted through an aperture I I1 in the bolt turning head 0 and projects within the spring I I3 in the orifice II2; a pin I I8 is mounted through the slot I I6 and projects within the shaft I03, thus the piston II4 slides on the pin II8, the head I I5 seating itself, within a seat or recess H9 in the bolt turning head III).

As the head of the bolt 56 moves up to the top position in the groove 89 of the delivery wheel 88, the shaft I 03 is rotated and thrust forward until the head of the bolt 56 enters the aperture formed by the lugs I I0a of the bolt turning head H0, the said head then turning the bolt 56 until the threaded end enters the nut I39 at the top or meeting point.

A nut hopper I2I mounted at the rear of the machine has a narrow gradient slide or chute I22 along its bottom edge, each side having a plurality of perforations I 23, a reciprocating distributing arm I24 is movably mounted on top of the slide I22 and retained thereon by a pair of guide bars I25 and I26 secured to opposed sides of the gradient slide I22 and being secured thereto by pins I21 and I28 therethrough; a roller I29 is mounted between the top ends of the bars I25 Ill) and I26 on a pin I30.

A split roller mounting I3I is secured to the outer surface of the rear wall of the nut hopper I2I adjacent the top thereof, a roller I32 is mounted over a pin I33 journaled through the split bosses I3Ia and I3I'b of the mounting I3I, the tapered end I24a of the reciprocating distributing arm I24 rides over the roller I32, while the body of the arm I24 rides under the roller I29 as the arm reciprocates.

, A roller I35 is secured to the forward boss end I24b of the reciprocating distributing arm I24 by a pin I36, said roller moving along the top of the slide I22 as it is motivated by the cam 69 mounted on the shaft 64, said cam being activated by the revolving shaft 64.

A spring I36a. is secured at one end to the pin I36 and the opposed end to the bar I26 to draw the roller back as the cam 69 revolves.

Alternating slots I31 and I38 on opposed sides of the reciprocating distributing arm I24, receive the nuts I39 as agitator arms I40 and MI re- \olve on a shaft I42 mounted through the nut hopper I2I.

A sprocket I10 secured over the outer end of the agitator shaft I42 is connected by a link chain Hi to a small sprocket I12 secured over the outer end of a shaft I13, said shaft has a flanged between the agitator arms I40 and I4I so that ing distributing arm vI24; the nuts I30 fall through the slots I 31 and I38 insaid arm and drop into the gradient slide I22 within which they move downward until said nuts drop, one at a time, on a shelf, platforrnor holder I44 attached to a support I45 mounted on table I4.

A sleeve I46 is mounted through a pair of supports'l45 and I41 mounted on the table I4, and a reciprocating plunger I48 is slidably mounted therein, said plunger having a reduced threaded end I49 which is screwed within a threaded aperture I50 in an elongated thrust carriage I5I slidably mounted upon an angular platform I52.

A U shaped clamp I53 is mounted around the platform I52 and-is secured to each side of the carriage or block I5I, moving back and forth with said carriage while the platform I52 remains stationary.

, Propecting portions I5Ia and I5Ib of the carriage I5I are formed by a recess I54 in the forward end of the said carriage, said recess being d rectly below the lower end of the gradient slide I22 when the carriage I5I is in the retracted position as illustrated in Fig. 7.

The opposite end of the plunger I48 has mounted thereon an H sleeve I55, a nut I56 is screwed over the threaded end I51 of the said plunger I48 for adjustment and to retain the H sleeve thereon, an adjustable tension nut I19 is screwed over the inner threaded portion I48a of the plunger I48 to provide a means for correcting the adjustment for synchronizing the reciprocating action of the plunger I48 with that of the shaft I03, the adjustment nut I56 providing the means for adjusting the tension of the safety spring I80 between the nut I19 and the H sleeve I which permits the same safety action as that of the shaft I03 and spring IOI, without rotation however.

A cam lever arm I58 is mounted upon a pin I58 withina split boss I60 secured to the mounting 43, the upper yoke portion I58a of said arm extending within the H sleeve I 55, the lower portion I58b has a roller I 6| rotatably secured thereto, said roller moving upon the cam edge 32a of the cam 32 rotating on the shaft I1.

A pin I8! is inserted through the bearing' bracket I41 and has an expansion spring I82 mounted thereover which presses against the upper end I58a of the cam lever arm I58 to counterbalance the pressure of the cam 32 against the ii glsller I6I mounted in the opposite end of the arm Thus as the cam 32 revolves the cam lever arm I 58 pivots and thrusts the plunger I46 in a re-' ciprocating action within the sleeve I46 causing the carriage I5I to move forward and back on the platform I 52, a nut I39 dropping upon the platform between the projecting portions I5Ia and I5Ib of the carriage I5I with each retraction of the said carriage.

The forward thrust of the carriage I5I is syn-- chronized with the forward thrust or movement of the bolt turning head IIO by the adjustable tension nut I19 which is then secured in that position by a set screw I18a; as the bolt 56 reaches the peak position in the delivery wheel 88, as illustrated in Fig. 6, the nut I39 is carried forward simultaneously to the edge of the platform I52 by the forward thrust of the carriage I5I the bolt turning head IIO assumes the position shown in Fig. 11 in which the bolt head is caught within the lugs IIOa of the bolt turning head IIO, the said turning head revolves as the delivery wheel 38 remains in this position threaded, 'it will not injure the machine as the (as illustrated in Fig. 8) the bolt 56 being turned or screwed within the nut I39 whereupon the assembled unit is carried downward to the rear of the delivery wheel 88 and drops within a chute I62 and is delivered therefrom into a container I63.

A release bar I64 moves up and down vertically with the action of a lever I65 mounted pivotally on a pin I66, said lever being pivoted as the rollers 69a. on the delivery wheel 88 contacts said lever I65 and carries the inner end of th lever downward until the contact is broken whereupon the lever I65 again moves up to the first position, the release bar I64 being up when the inner end of the lever is in the down position and moves down as the inner end of the lever moves back to its original position.

If for any reason the nuts I39 are not released, the bolt 56 travels around the delivery wheel 88 to the chute I62, but as the weight of the bolt is unbalanced due to the lack of the nut I39 to balance the head of said bolt, the bolt tips over the chute and drops into a tray I61 secured on the table l4 adjacent the chute I62.

If the bolt 56 does not release and fails to meet the nut I39, the nut is projected forward and falls into a trough I68 under the carriage I 5| and is ejected on the opposite side of the chute I62 and adjacent thereto.

If a bolt or nut goes through without being operation will complete itself by ejecting both bolt and nut into the discard tray I61 and trough I68 respectively.

If it becomes necessary to check the passage of the bolt 56, the nuts I39 may be locked within the gradient slide I22 as illustrated in Fig. 7; a shaft I85 tapered at one end I86 has a knurled head I81 at its opposite end and a pin I88 therethrough adjacent the head I81 is mounted through a sleeve I89; said sleeve has a slot I890. at its outer end and is flanged at I90, said flange pressing against the outer surface of the support 66; the opposite end of the sleeve I89 has a threaded portion I9I thereon and a nut I92 turned thereon against the inner surface of the suport 66, thus holding the sleeve I89 in a rigid position.

A flange I93 on the shaft I85 adjacent the tapered portion I86 retains a spring I94 on the shaft I85 between the sleeve I89 and said flange I93, thus the knurled head I81 may be drawn outward, compressing the spring I94 between the flange I93 and the sleeve I89; and rotated until the pin I88 registers with the slot I89a in the sleeve I89, whereupon the knurled head is-released and the pin enters the slot which causes the tapered end I86 to enter an aperture I95 in the gradient slide I22 thus preventing the further passage of the nuts I39.

An idler I16 is supported on a pin I11 mounted through an arm I18 secured to the rear of the auxiliary shaft support 96 to take up the slack in the link chain 62 between sprockets 6| and 63.

Interchangeable heads I96 and I91 for hexagon and round head bolts may replace the head II 0 for square head bolts as illustrated in Figs. 16, 1'1, and 18.

The general operation is evidently aparent from the above, but it may be summarized as follows: bolts are fed from the hopper 53 down the track 51 to the notched wheel 88 by which they are stepped around to threading position. Nuts are fed from the hopper I2I down the chute I22 to the holder I44, where they are registered with the bolt then at the threading position. The nut is then advanced by the slide I5I and at the same time the bolt is advanced and rotated by the head III! on the rotary reciprocating shaft I03 and the nutted bolt is carried along and discharged by the next operation of the wheel 96 which brings the next bolt to position to receive the next nut; and so on. The operations are properly timed by the cams. The action of the various safety devices and antijamming devices is evident from the foregoing particular description.

In the modifled form, of the machine hereinabove described, the Figs. 21 through 24 illustrate a means whereby bolts of any reasonable length may be delivered through the machine, receiving nuts thereon as heretofore described.

It was deemed not necessary to show all details in Fig. 21 as were. shown in Fig. 6, nor in Figs. 22 and 28 as shown in Figs. 2 and 4, but enough are shown to identify the altered and substituted parts and their positions in relation to the balance of the parts as shown in Figs. 6, 2 and 4.

When it is desired to assemble nuts on bolts that are of the same diameter but different lengths it is necessary to have different parts of the mechanism adjustable to the difierent bolt lengths-which in turn necessitates some rearranging of other parts.

The cam 25 mounted on the shaft I1 adjacent cam 23 is now positioned to the left of the thin new delivery wheel I99 which replaces the delivery wheel 88, the cam 23 is moved slightly to the left toproperly'contact the rollers I98 of the wheel I99. The delivery wheel I99 has a long hub 200 with an elongated keyway 20I therein with a small key 202 over which is mounted a supporting delivery wheel 203.

A short shaft 204 is substituted for the long shaft 81 and is supported within bearing brackets 205 and 206 mounted on the table I4. Thus it will be seen that the suporting delivery wheel may be mounted over the hub 200 in adjustable positions relative to the length of the bolts 56a.

The spaced grooves or notches 203a, in the said supporting .delivery wheel, register with like spaced grooves or notches I99a in the delivery wheel I99 and support the end of the bolt 56a therein.

A plurality of spaced apertures 201 in the table I4 permit the insertion of a pin 208 therein to set the adjustable mounting carriage 209 when properly placed, the said pin projecting through an aperture 2! in the mounting carriage which registers with any one of the apertures 201 in the table I4.

A hand operated shaft 2 mounted through bearing brackets 2I2 secured on the bottom surface of the table I4, has a gear 2I3 secured on its inner end by a set screw 2| 4, said gear contacting and meshing with a gear rack 2I5, on the underside of the adjustable mounting carriage 209, through a slotted aperture 2I6 in the table I4 as the shaft 2 is rotated by the handle 2IIa.

A clamping dog 2", tightened by a bolt H8 and nut 2I9 to the' table I4, locks the mounting carriage 209 when properly set in position.

A bearing mounting 220 on the extreme lower end of the upright 209a of the mounting carriage 209 is secured over the hub 22Ia of the cam 22I, which replaces cam 32, mounted on 0 The rear chute the shaft H by a lock spacer 222 and set screw 223.

An aperture 20% in the adjustable mounting carriage 209 registers with the shaft 204 and is for the purpose of quickly assembling or moving the shaft without disturbing the balance of the mechanism when the mounting carriage 209 is in the closer adjustable positions.

A split bracket 224 is mounted on the outer surface of the upright 209a to replace the split boss I shown in Fig; 6, and a reversed cam lever arm 225 replaces the arm I58 which operates the nut operating mechanism through the rotation of the cam 22i in precisely the same manner as does the cam lever I58 through the cam 32 as shown in Fig. 6 and hereinahove described.

A top mounting 226 secured to the top of the mounting carriage 209 and upright 209a moves with the said mounting carriage, the nut arresting assembly being mounted therein in the same manner as in the original machine.

A center bearing mounting 22'! has the shaft 84 mounted therethrough said shaft has a keyway 64a therein and a key 228 in the keyway over which is mounted a bushing 229 within the center bearing mounting. A cam 23!! which replaces the cam 69 is mounted over the bushing 229 and secured thereto by a taper pin 23l which projects through the shaft 64;

The gear 68 is relocated adjacent to the outer end of the center bearing mounting and secured to the shaft 64 by a set screw 68a, said gear meshing with the gear ill which is now mounted over a shaft 282 which shaft rotateswithin a bearing boss 233 at the top of the mounting carriage 209.

The sprocket H2 is mounted over the end of shaft 232 and secured by a lock washer 234. The sprocket H0 is mounted on the agitator shaft M2 to the right of the nut hopper i2| instead of the left and is connected by the link chain iii to the smaller sprocket H2.

It is necessary to change the position of the spring 19, slightly to the left and to increase the length of the roller spring arm 235 to enable the roller a to move along the outer periphery of the cam 25 in its new position.

The gradient or track 51 is attached to a supporting plate 238, said plate having apertures 236a at set intervals to secure said plate 'to the movable support 231 in any of its adjusted positions without changing the position of the gradient and the bolt arresting mechanism The adjustable positions of the support are necessary, due to the clearance allowance between the gradient 51 and the support for the additional length of the bolts.

I62 has extension bars l82a and I821: for adjustment purposes also, due to the extra lengths of said bolts and to prevent an overbalance in weight as the bolts and nuts are discharged.

I claim:

1. In a machine for screwing nuts on bolts, the combination of a bolt carrying wheel rotating step by step, a rotary and reciprocating shaft having a socket head thereon engaging the head of a bolt while it is held by the wheel in the threading position, a nut holder reciprocating in axial alinement with said shaft and adapted to hold a nut while the bolt is screwed thereinto, and means to simultaneously move said shaft and said holder axially toward and from each other, and means to rotate the shaft. whereby said axial movement of the shaft causes the bolt to be advanced to engage the nut while the latter is being advanced by the holder.

2. The combination stated in claim 1, the means to advance the shaft and holder toward each other including a pair of oppositely acting levers acting against the outer ends of the shaft and holder respectively, a timing shaft, and a pair of cams carried by the timing shaft and respectively engaging the levers.

3. The combination stated in claim 1, the head having therein a spring pressed plunger to eject the bolt after the nut is screwed thereon, said plunger having an enlarged head which seats against the bottom of the socket.

4. The combination stated in claim 1, the means for rotating the wheel step by step and for advancing and retracting the reciprocating shaft and the nut holder comprising a timing shaft and cams thereon respectively connected respectively to the reciprocating shaft, the holder, and the bolt carrying wheel.

5. The combination stated in claim 1, the nut holder comprising a reciprocating block to advance a nut toward the bolt when in threading position, means to operate the block comprising a rod, a sleeve on the rod, a lever engaging said sleeve, a timing shaft, and a cam on the timing shaft acting against the lever.

6. In a machine for screwing nuts on bolts the combination of a bolt carrying wheel rotating step by step, a rotary and reciprocating shaft having a socket head thereon engaging the head of a bolt while it is held by the wheel in the threading position, means to rotate the shaft. a sleeve on the outer end of the shaft, a lever engaging said sleeve to advance and retract the shaft, a nut holder at the opposite side of i the wheel, comprising a shelf on which a nut may rest, a plunger slidable across said shelf .in line with the axis of the shaft, a sleeve on the plunger, a lever engaging said sleeve, and means to synchronize the movement of the wheel, the shaft and the plunger comprising a timing shaft and a plurality of cams thereon engaging the levers and the wheel respectively. i

WALTER MAJUSICK. 

